Unbalanced matchmaking?

I know it's just normal games and it's casual, but I'm started to get really annoyed by this. The matchmaking in preseason seems to be severely broken. Why is the enemy getting a diamond 2 player, 2 plat and 2 gold, when I get 1 gold, 2 silver and an unranked?? (I had the highest rank, being plat 5). Of course we lost hard. And this isn't a one-case-scenario, it's been going on for so long, the entire preaseason. I'm putting ranked on hold for next season and trying to just have some relaxed fun in preseason. But the matchmaking is so retardedly skewed that I'll either get the short end of the stick and have a terrible team vs a good one. Or I'll have the long end of the stick and have a boring 20-minutes then surrender game because the enemy can't do anything. What the actual fuck is going on, riot? You can't be serious.
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